Threading is safe. Threading is suitable for removing fine as well as coarse, long as well as very short hair, which definitely gives it an edge over many methods of hair removal. Unlike tweezing, threading removes one clean line of hair all at once, making it much quicker and easier to shape the brows. Threading can be used to eliminate a unibrow, raise the arch of the eyebrow, or add shape and definition to the brow. Re-growth is between 2-4 weeks, depending on hair growth.